How to take schema backup

Hi All,
Can you please tell me how to take schema backup.
DB : 10.2.0.2
Thanks in advance.

1. 1. what is the time difference between for this two utilities to export the data for a schema, i.e "expdp" and "exp"?Go for EXPDP
2. If i using COMPRESSION option in "expdp" utility, how many times data size will be reduced to original size?When “Y”, export will mark the table to be loaded as one extent for the import utility. If “N”, the current storage options defined for the table will be used. Although this option is only implemented on import, it can only be specified on export.
3. 3. With out importing the data, how can i check the data which is exported, is correctly exported or not? You can do import with show=y option. This will not import any thing in the database. this will only generate the Sql file and your Export file can be validated. This will work similar to normal import except that this will not insert anything in the database.
Imp 'userid/password' fromuser=userid touser=userid show=y file=filename.dmp log=logfile.log
Regards

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